To provide a filter mounting device capable of easily changing a filter by a relatively simple operation in a dust collector and a vacuum cleaner.

A filter mounting plate 9 having filter mounting brackets 10A and 10B on a bottom side is provided on a partition plate 8 to partition the inside of a machine body 1 of the dust collector into upper and lower chambers of a cleaning chamber 15H and a dust chamber 1H, and the filter 4 is mounted on the brackets 10A and 10B in a suspended manner. A filter attaching/detaching clamp 12 capable of tightly pressing a filter pressing unit 12C provided on the bottom side against a dirty side packing 7 of the filter 4 when downwardly pressed and turned is provided on an upper surface side of the filter mounting plate 9.